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प्रश्न
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
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उत्तर
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संबंधित प्रश्न
Define work.
What is the ratio of SI units to CGS units of 'work'?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Name the CGS unit of work.
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Calculate the work done when:
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